As seen at Slate:
Two Guns Per PersonTL;DR: The Second Amendment doesn’t say how many guns you can have. Nobody needs more than two guns. If someone wants a third gun, it’s full NFA procedures and taxes.
Why is this legal? I’m not talking about why we don’t require reporting multiple sales of long guns to federal authorities (which we don’t). I’m not talking about the bump stocks the shooter used to make his semi-automatic weapons fire like machine guns. I’m talking about why people are allowed to own more than, say, two firearms without a really good reason.
Doug Pennington notably does not address how to figure who might have more than two firearms. Nor does he explain how the powers that be will go about collecting the extant extras. Certainly he isn’t volunteering to collect them; possibly he’s seen my observation regarding the wisdom of kicking in millions of door because the occupants are well-armed.
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